Year	Percent
1950	17.14074
1955	17.69484
1960	17.4082
1965	19.38527
1970	19.73587
1975	13.67024
1980	14.21528
1985	12.06489
1990	13.81038
1995	14.31712
2000	11.58921
2005	10.14694
2010	8.84771
2015	9.04748
2020	9.07669
2025	8.60348
2030	7.66722
2035	6.72776
2040	6.20985
2045	6.09374
2050	6.03281
2055	5.7981
2060	5.40768
2065	5.02862
2070	4.82935
2075	4.81132
2080	4.84022
2085	4.78275
2090	4.62881
2095	4.44727
2100	4.33627